Karan's 'children' Varun, Sid and Alia congratulate him on the birth of his twins

Mumbai: Karan Johar is over the moon with the birth of his twins, and Bollywood has been joining him in his joy.

However, the most happy seem to be his 'Students,' Alia Bhatt, Varun Dhawan and Sidharth Malhotra, whom he had famously referred to as his children.

Karan, incidentally, had launched them in his directorial, 'Student of the Year'.

All three took to their respective feeds to congratulate the ace director-producer.

Karan became a father to twins, a boy and a girl, in February and has named them Yash and Roohi. The names are inspired by the names of his own parents, Yash and Hiroo.

The filmmaker had often expressed his desire to become a father and had spoken about it in detail in his recent autobiography ‘An Unsuaitable Boy.’